A Pathway for the Growth of Core–Shell Pt–Pd Nanoparticles

Narula, Chaitanya K.; Yang, Xiaofan; Li, Chen; Lupini, Andrew R.; Pennycook, Stephen J.

doi:10.1021/acs.jpcc.5b08119

Cited by 16 publications

(9 citation statements)

References 42 publications

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“…Starting from the hexagonal equilibrium shape, the cracks initiate a transition to the kinetic shape, where the shape is limited by the slowest-growing facets instead of the lowest-energy facets. Our experimental observation shows that the mass transfer between particles does not depend on the size of the particles but on crack defects, which is different from Ostwald ripening 1 , digestive ripening 15 , intra-particle ripening 23 , and merging of core-shell particles 24 (Supplementary Fig. 6 and Methods).…”

Section: Resultsmentioning

confidence: 72%

Defect-mediated ripening of core-shell nanostructures

et al. 2022

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Understanding nanostructure ripening mechanisms is desirable for gaining insight on the growth and potential applications of nanoscale materials. However, the atomic pathways of nanostructure ripening in solution have rarely been observed directly. Here, we report defect-mediated ripening of Cd-CdCl2 core-shell nanoparticles (CSN) revealed by in-situ atomic resolution imaging with liquid cell transmission electron microscopy. We find that ripening is initiated by dissolution of the nanoparticle with an incomplete CdCl2 shell, and that the areas of the Cd core that are exposed to the solution are etched first. The growth of the other nanoparticles is achieved by generating crack defects in the shell, followed by ion diffusion through the cracks. Subsequent healing of crack defects leads to a highly crystalline CSN. The formation and annihilation of crack defects in the CdCl2 shell, accompanied by disordering and crystallization of the shell structure, mediate the ripening of Cd-CdCl2 CSN in the solution.

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Section: Resultsmentioning

confidence: 72%

Defect-mediated ripening of core-shell nanostructures

et al. 2022

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“…Although TEM/STEM has been employed to explore the growth mechanism of CS structures in 2D 10,18,[40][41][42] , it was speculated that the intermixing of core and shell atoms could happen before a perfect shell was formed 43 . Our experimental study of 3D interfaces in CS-NPs reveals several observations at the single-atom level.…”

Section: Discussion and Outlookmentioning

confidence: 99%

Probing the atomically diffuse interfaces in core-shell nanoparticles in three dimensions

Xie

Zhang

et al. 2022

Preprint

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Deciphering the three-dimensional atomic structure of solid-solid interfaces in core-shell nanomaterials is the key to understand their remarkable catalytical, optical and electronic properties. Here, we probe the three-dimensional atomic structures of palladium-platinum core-shell nanoparticles at the single-atom level using atomic resolution electron tomography. We successfully quantify the rich structural variety of core-shell nanoparticles including bond length, coordination number, local bond orientation order, grain boundary, and five-fold symmetry, all in 3D at atomic resolution. Instead of forming an atomically-sharp boundary, the core-shell interface is atomically diffuse with an average thickness of 4.2 Å, irrespective of the particle’s size, morphology, or crystallographic texture. The high concentration of Pd in the interface is highly related to the electric double layers of the Pd seeds. These results advance our understanding of core-shell structures at the fundamental level, providing potential strategies into nanomaterial manipulation and chemical property regulation.

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“…There are many investigations about bimetallic nanoparticles − whereas there are a few reports for structure and stability of trimetallic NPs including Pd, Ag, and Pt in the literature. ,− Also, there are rare theoretical studies about the trimetallic nanoparticles. − Tao et al studied the stable structure of tetrahexahedral Pt-X-Cu (X = Au, Ag, Pd, and Rh) trimetallic NPs via adopting quantum Sutton-Chen (Q-SC) many body potentials and an improved genetic algorithm . They also investigated the structural stability and segregation behavior of the Pt-alloy NPs with different sizes and compositions.…”

Section: Introductionmentioning

confidence: 99%

Stability Control of AgPd@Pt Trimetallic Nanoparticles via Ag–Pd Core Structure and Composition: A Molecular Dynamics Study

Akbarzadeh

Abbaspour

Mehrjouei

et al. 2018

Ind. Eng. Chem. Res.

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In this research, we have simulated AgPd@Pt nanoparticles with different core structures (including the fcc, bcc, amorphous, phase-separated, and ordered structures) and different core compositions in the heating process. Our investigations showed that the phase-separated core nanocluster has higher melting temperature, and therefore, it has more thermal stability than other clusters while the bcc core nanocluster has lower melting temperature. The melting point also increases by increasing the Pd mole fraction in the cluster core. The results also showed a decrease in the configurational energy, C V , and surface energy before the melting point which is due to the diffusion of the Ag and Pd atoms to the clusters surface before the melting points. By increasing the temperature more, the different atoms of the clusters mix and form alloy structures. These results have also been approved by the radial chemical distribution function (RCDF). In order to present a complete structural investigation, the atomic strain distribution has been calculated for AgPd@Pt nanoclusters with the various core structures and compositions. The results showed that the palladium and silver atoms in the nanocluster core have more strain than the platinum atoms in the nanocluster shell. The tensile strain also exists in the cluster core, and the compressive strain exists in the nanocluster shell.

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A Pathway for the Growth of Core–Shell Pt–Pd Nanoparticles

Cited by 16 publications

References 42 publications

Defect-mediated ripening of core-shell nanostructures

Defect-mediated ripening of core-shell nanostructures

Probing the atomically diffuse interfaces in core-shell nanoparticles in three dimensions

Stability Control of AgPd@Pt Trimetallic Nanoparticles via Ag–Pd Core Structure and Composition: A Molecular Dynamics Study

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